Antiwhaling activist: Not all species of whales are threatened with extinction. Nevertheless, given the highly mechanized technology used in whaling, a ban on the whaling of endangered species cannot be enforced without banning the whaling of all other species. Hence, since hunting endangered whale species should be banned, all whale-hunting should be banned.
Which one of the following principles, if established, would do the most to justify the conclusion drawn by the antiwhaling activist?The activist argues that endangered whale hunting should be banned, but that ban cannot be enforced unless all whale hunting is banned. So the missing principle must say that if one activity must be prohibited, then other activities that prevent enforcement of that prohibition should also be prohibited.
The key issue is
enforceability.
(A) The fishing industry has a right to hunt members of species that are not endangered.
Wrong. This weakens the activist’s conclusion because it supports the right to hunt nonendangered whale species.
(B) If a certain activity ought to be prohibited, so should any other activity that interferes with the enforcement of that prohibition.
Correct. If hunting endangered whales should be banned, and hunting other whales makes that ban unenforceable, then hunting other whales should also be banned. This principle directly justifies the move from banning endangered-whale hunting to banning all whale hunting.
(C) No industry should adopt new technologies if the adoption of those technologies would create new ethical problems.
Wrong. The conclusion is not about whether whaling technology should have been adopted. It is about whether all whale hunting should now be banned.
(D) All actions that are instrumental in achieving ends that are permissible are themselves permissible.
Wrong. This is about what is permissible, not what should be prohibited. It does not support the ban.
(E) If a commercial form of a certain activity ought to be prohibited, then so should all noncommercial forms of that activity.
Wrong. The argument does not distinguish commercial from noncommercial whaling.
Answer: (B)